James devinb



(No Model.) 8 J; DEVINE.

VENTILATOR FOR BLAST PIPES. No. 270,182. Patemed J anLZ; 1883.

ATTESTZ INVENTORZ Awe/@ 98 W Ma a/My WWW v scribed.

UNITED STATES PATENT OFFICE.

JAMES DEVINE, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO FRANZ KREIN, QF SAME PLACE.

, SPECIFICATION forming part of Letters Patent No. 270,182, dated January 2, 1883.

Application filed April 12, 1881. (No model.)

. Forges, &o., of which the following is aspecification;

The objectot' my invention isto provide-improved means to prevent the explosion of blast or wind pipes ot't'orges, 8170., caused by the light explosive gases that enter said pipes from the fire when the fan or blower is stopped for a time from any cause. I

My improvement consists in the provision in said pipes of a valve having a stem sliding in a sleeve or guide on a bridge extending over the valve-seat,"and having an arm at right angles to thesleeve, providedwitha screw secured to the upperend of a spiral spring connected to the bridge, the tension of the spring being regulated by a nut working on the screw and turning on the arm, as hereinafter de- The drawing is a vertical section of the improved valve.

A represents the blast or wind pipe of a forge, roasting-furnace, or any other form of furnace in which the combustion is forced by inwardly by the pressure of a spring, 0, securedat its lower end to a bridge, E, and at its upper end to a screw,c, turning in an arm, (1, extending from the stem D of the valve.1 The stem D slides in a sleeve or guide, 0, on the bridge E. The pressure of air in the pipe tends to hold it to its seat and prevent any leakage of air while the fan or blower is in operation. The tension of the spring is regulated by a nnt,c, turning on the arm and work,- ing on the screw, so as to regulate the closing of the valve to any required pressure in the pipe A.

In the practical construction of myimprovement the seat or valve may be faced with an elastic materialsucl1 as rubber, &c.to form a betterjoint; or a plain metallic face may be used, as found convenient or desirable.

The following is what I claim as new herein and desire to secure by Letters Patent:

The combination of blast or wind pipe A, casing B, having valve-seat b. valve (3, having stem D, provided with arm cl, bridge E, having sleeve or guide is, spring a, screw 0, and not 0,

as set forth.

In testimony whereof witness my hand this 30th day of March, 188i, at St. Louis, State of Missouri.

' JAMES DEVINE.

In presence of RoB'r. BURNS,

O. W. BEEHLER. 

